824 ORCIIIDES. 



DICIIAEA. 



5. DICIIAEA OERSTEDII Rchb. ni. Bonpl. III. 219: 



Aff. D. 8'aucae Lindl. foliis brevioribus (sesquipollicaribiis) latioribus, 

 labelli bene unguiculali lamina oblonga utrinque ter sinuata. 



Caules adsunt ulirapedales. Folia praesenim vaginas subcaeruleo pruinosas o(Te- 

 rentia ligulatooblonga apice obiusata cum apiculo. Flores numerosi — nobis tantum 

 ex icone Ocrstediana noti. Scpaia irianguiolanceolata subacuta. Tepala breviora 

 laiiora. In summo monte El Viego. Oersied. 



1466. ODO]\'TOO£.OSSU]ni H. B.. K. 



Nov. Gen. el Sp. I. 351. L, 0. p. 211, 



Lindl. Fol. Odonioglossum haec: 



Sepala explanata, libera; lateralibus nunc basi connatis, nunc un- 

 guiculalis elongatis. Petala subaequalia, nunc paulo teneriora. Labellum 

 basi cum columna parallelum eique medio adnatum, limbo deflexo. basi 

 varie cristatum rarissime nudum. Columna clavata, saepius elongata, 

 basi angusta nunc in membranam utrinque expansa, apice auriculata aut 

 aptera. Stigma fovea circuiaris. Pollinia 2, pyrilormia, solida aut pos- 

 tice excavatfa; caudicula lineari ; glandula ovaii. Herbae epiphytae et 

 terrestres, Mexicanae, Peruvianae et Novogranatenses, pseudobulbosae. 

 Folia coriacea v. papyracea. Racemi radicales 1-100-flori, aut paniculae, 

 saepe speciosissimae. 



A genus allied to Oncidium frora which it is chiefly distinguishable by its co- 

 lumn being long, and usually narrow. at ihe base, or at all events not tumid there 

 and by the base of the lip being ahvays parallel with the face of the column. No 

 oiher difference has yet been observed; but it may be added. that ihe lateral sepals 

 are very rarely united. The two genera unite by Od. naevium , which is very like 

 Oncidium phymatochilum, and by Od. cosiatum and its allies, which run into the On- 

 cidia microchila. The crest is extremely variable in its composilion, but it usually 

 consists of a pair of parallel lamellae , between which arise various tumours and 

 plaies, ihe ceniral one of which always really occupies ihe axis of tlie lip. la some 

 instances, however, especially araong the Trymenia , liitle or no irace is discoverable 

 of that mode of arrangement. 



Analysis of Ihe sections. 



Clinandrium nudura. 



Columna cirrhata ' §• !• Eiiodontoglossum. 



Columna auriculata aut aptera. 



Labellum manifesie unguiculaium. luteum §.2. Xanllioglossim. 



album aut roseum §.3. Leucoglossum. 



Labellum sessile. 

 Sepala lateralia parallela elongata unguiculala .... S- 4. Myanthium. 

 3. Labellum cordatum in npicem longum productum. 

 b. ., oblongum vcl basi angusiatum. 

 Sepala radiantia subaequalia ; lateraiibus scssilibus aut 

 parum unguiculalis §.5. Isanthium. 



a, Sepala ci pctala sub anthcsi longe distaniia. 



b. .. .. inibricata. 



Clinandrium cucullatum. marginc mcmbranaceo $.6. Trymenium. 



